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Asked: 2026-05-30T06:41:33+00:00

How can I limit my database column’s integral input to a specific number of

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How can I limit my database column’s integral input to a specific number of digits ?

CREATE TABLE tab (id INT <1 digit> not null, value INT <10 digits> not null);

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1 Answer

  1. Editorial Team

    Add a check constraint (SQL Server) or trigger (MySQL, doesn’t support CHECK constraints)

    SQL Server example:

    CREATE TABLE tab (
    id tinynot null CHECK (id BETWEEN 0 AND 9), 
    value INT not null CHECK (id BETWEEN 1000000000 AND 9999999999)
);
    • If you only want one digit though, then use tinyint
    • If you aren’t storing numbers (eg “123456789 bananas”) but, say, phone numbers then use a varchar type. See https://stackoverflow.com/a/8284674/27535

    Edit, you’d need a trigger in MySQL

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